Robinhood charges $0 in fees, so nothing. The trend in ETFs is reducing fees, there’s now zero fee ETFs too. Even if you use a discount brokerage that charges 3-4$ per trade the break even point is quite low, so store it as cash until you’re happy with the fee ratio.

How much do you lose in fees when you buy crypto? 1-2%? Plus insane volatility. If you’re low income that volatility is crippling.